JP5083462B2 - Communications system - Google Patents

Abstract

Base station 101 sets, when a transmission power value set in advance is smaller than a threshold set in advance, the threshold as a power value to be notified, sets a value obtained by subtracting the threshold from the transmission power value as a compensation power value, and transmits the power value to be notified and the compensation power value to UE 301. UE 301 receives the power value to be notified and the compensation power value transmitted from base station 101.

Description

  The present invention relates to a communication system, a radio base station, a radio base station control device, a communication terminal, and a transmission power value notification method for notifying a signal transmission power value.

  In recent years, wireless communication technology has been rapidly spread, and there are various physical channels on the wireless communication. Among them, one of the channels in the downlink direction (direction from the radio base station to the communication terminal) is a primary common pilot channel (Primary CPICH: Common Pilot Channel) in which the power intensity is used on the basis of handover or the like ( For example, refer nonpatent literature 1.). A transmission power value used when this primary common pilot channel (hereinafter referred to as “Primary CPICH”) is transmitted is notified from the radio base station to the communication terminal. This transmission power value is indicated in a predetermined radio control message transmitted from the radio base station to the communication terminal.

  FIG. 1 is a diagram illustrating a transmission power value of a Primary CPICH indicated in a radio control message defined by standardization.

  As shown in FIG. 1, the setting range of the transmission power value (Tx Power) of the Primary CPICH is −10 to 50 [dBm].

3GPP TS25.331

  Recently, for example, a small wireless base station apparatus that has only a communicable range of several M to several tens of M is installed indoors such as a house or a company. In such a small radio base station apparatus, there may be a case where it is only necessary to have a smaller communication range, and the transmission power value of the Primary CPICH transmitted from the small radio base station apparatus may be a very small value. Absent. For example, when the communication range is several meters or less, it is only necessary to transmit the Primary CPICH with a transmission power value lower than −10 [dBm].

  In addition, when these small wireless base station devices are started up, the received power and power attenuation rate from neighboring macro wireless base station devices and small wireless base station devices are ascertained, and these wireless base stations are affected. It is considered to reduce the transmission power so that the Therefore, the transmission power of the signal transmitted from the small radio base station device is required to be a small value.

  Furthermore, when the radio base station apparatus has a saving mode in a time zone where there is no user to use such as at night, it is considered to reduce transmission power in order to reduce the coverage itself. Therefore, the transmission power of the signal transmitted from the small radio base station device is required to be a small value.

  However, when the transmission power value of the Primary CPICH can be set only in the above-described range, a transmission power value smaller than that range (for example, −50 [dBm] smaller than −10 [dBm]) may be set. Can not. Therefore, the radio base station apparatus cannot notify the communication terminal that it wants to transmit the Primary CPICH with a transmission power value smaller than the above range, and the communication terminal cannot know it.

  For example, the uplink transmission power of the communication terminal is determined in conjunction with the transmission power value of the Primary CPICH. Therefore, there is a problem that a communication terminal that has not received the notification consumes unnecessary power even when the transmission power value for the radio base station apparatus may be sufficiently small.

  In addition, since it cannot be set as described above, the transmission power value of the Primary CPICH transmitted from a radio base station such as a small radio base station apparatus becomes an unnecessarily large value, resulting in radio interference or uselessness. There is a problem that power consumption occurs.

  An object of the present invention is to provide a communication system, a radio base station, a radio base station control device, a communication terminal, and a transmission power value notification method that solve at least one of the above-described problems.

The communication system of the present invention includes:
A communication system including a communication terminal and a radio base station that transmits a reference signal to the communication terminal,
When the transmission power value preset as the transmission power value of the reference signal is smaller than a preset threshold, the radio base station uses the threshold as a notification power value, and determines the threshold from the transmission power value. A value obtained by subtracting is used as a corrected power value, and the notification power value and the corrected power value are transmitted to the communication terminal,
The communication terminal receives the notification power value and the corrected power value.

The communication system of the present invention
A communication terminal having a wireless communication function, a radio base station that performs radio communication with the communication terminal and transmits a signal of the primary common pilot channel to the communication terminal, and a radio base station control apparatus that controls the radio base station A configured communication system comprising:
When the transmission power value preset as the transmission power value of the primary common pilot channel is greater than or equal to a first threshold set in advance, the radio base station control device notifies the transmission power value to the first notification. When the transmission power value is transmitted to the radio base station as a power value, and the transmission power value is smaller than the first threshold, the first threshold is set as the first notification power value, and the first power is calculated from the transmission power value. A value obtained by subtracting the threshold is set as a first correction power value, and the first notification power value and the first correction power value are transmitted to the radio base station,
When the first notification power value transmitted from the radio base station control device is different from the first threshold, the radio base station transmits the first notification power value from the radio base station. When the first notification power value transmitted from the radio base station controller is the same as the first threshold, the radio base station controller recognizes the transmission power value of the primary common pilot channel as A value obtained by adding the transmitted first correction power value and the first notification power value is recognized as a transmission power value of the primary common pilot channel transmitted from the radio base station, and the recognized transmission If the power value is greater than or equal to a preset second threshold value, the transmission power value is transmitted to the communication terminal as the second notification power value with the transmission power, and the transmission power value is the second power value. When smaller than a threshold value, the second notification power value is set as the second notification power value, a value obtained by subtracting the second threshold value from the transmission power value is set as a second correction power value, and the second notification power value is set. Transmitting the value and the second corrected power value to the communication terminal with the transmission power,
When the second notification power value transmitted from the radio base station is different from the second threshold, the communication terminal transmits the second notification power value from the radio base station. When the second notification power value recognized as the transmission power value of the common pilot channel and transmitted from the radio base station is the same as the second threshold, the second power transmitted from the radio base station Is added as the transmission power value of the primary common pilot channel transmitted from the radio base station.

In addition, the radio base station of the present invention,
A radio base station that performs radio communication with a communication terminal having a radio communication function and transmits a signal of a primary common pilot channel to the communication terminal,
A memory for storing a transmission power value set in advance as a transmission power value of the primary common pilot channel;
A transmission power value comparison unit that compares the transmission power value stored in the memory with a preset threshold value;
As a result of comparison in the transmission power value comparison unit, when the transmission power value is equal to or greater than the threshold value, the transmission power value is set as a notification power value, and when the transmission power value is smaller than the threshold value, the threshold value is notified. A radio control message assembling unit that assembles a radio control message including the notification power value and the correction power value, with a power value, a value obtained by subtracting the threshold from the transmission power value as a correction power value;
A transmission unit configured to transmit the radio control message assembled by the radio control message assembly unit to the communication terminal with the transmission power.

In addition, the radio base station of the present invention,
A radio base station that performs radio communication with a communication terminal having a radio communication function and transmits a signal of a primary common pilot channel to the communication terminal,
A notification power value comparison unit that compares the first notification power value transmitted from the radio base station control device that controls the radio base station with a preset first threshold value;
The primary common pilot channel transmitted from the radio base station when the first notification power value is different from the first threshold as a result of comparison in the notification power value comparison unit. When the first notification power value and the first threshold value are the same, the first correction power value and the first notification power transmitted from the radio base station control device are recognized. A recognition unit for recognizing a value obtained by adding a value as a transmission power value of the primary common pilot channel transmitted from the radio base station;
A transmission power value comparison unit that compares the transmission power value recognized by the recognition unit with a preset second threshold;
If the transmission power value is greater than or equal to the second threshold as a result of the comparison in the transmission power value comparison unit, the transmission power value is set as a second notification power value, and the transmission power value is greater than the second threshold. If the second notification power value is smaller, the second notification power value is set as the second notification power value, and a value obtained by subtracting the second threshold value from the transmission power value is set as a second correction power value. A radio control message assembling unit that assembles a radio control message including the second correction power value;
A transmission unit configured to transmit the radio control message assembled by the radio control message assembly unit to the communication terminal with the transmission power.

Further, the radio base station control device of the present invention,
A radio base station control apparatus that controls a radio base station that transmits a signal of a primary common pilot channel to a communication terminal having a radio communication function,
A memory for storing a transmission power value set in advance as a transmission power value of the primary common pilot channel;
A transmission power value comparison unit that compares the transmission power value stored in the memory with a preset threshold value;
As a result of comparison in the transmission power value comparison unit, when the transmission power value is equal to or greater than the threshold value, the transmission power value is set as a notification power value, and when the transmission power value is smaller than the threshold value, the threshold value is notified. A transmission message assembling unit that assembles a transmission message including the notification power value and the correction power value, with a power value, a value obtained by subtracting the threshold value from the transmission power value as a correction power value,
A transmission unit configured to transmit the transmission message assembled by the transmission message assembly unit to the radio base station.

The communication terminal of the present invention
A communication terminal having a wireless communication function and configured to be connectable to a wireless base station that transmits a primary common pilot channel signal,
A notification power value comparison unit that compares a notification power value included in a radio control message transmitted from the radio base station with a preset threshold;
As a result of comparison in the notification power value comparison unit, when the notification power value and the threshold value are the same, an extraction unit that extracts a correction power value from the radio control message;
A calculation unit that adds the notification power value to the corrected power value extracted by the extraction unit;
As a result of comparison in the notification power value comparison unit, when the notification power value and the threshold value are different, the notification power value is recognized as a transmission power value of the primary common pilot channel transmitted from the radio base station, A recognizing unit that recognizes a value calculated by the calculating unit as a transmission power value of the primary common pilot channel transmitted from the radio base station when the notification power value and the threshold value are the same;

Moreover, the transmission power notification method of the present invention includes:
A transmission power value notification method in a communication system comprising a communication terminal having a wireless communication function and a radio base station that performs radio communication with the communication terminal and transmits a signal of a primary common pilot channel to the communication terminal. ,
A process in which the radio base station compares a transmission power value set in advance as a transmission power value of the primary common pilot channel with a preset threshold value;
The wireless base station, as a result of the comparison, when the transmission power value is greater than or equal to the threshold value, the transmission power value as a notification power value, processing to transmit the notification power value to the communication terminal,
The wireless base station, as a result of the comparison, if the transmission power value is smaller than the threshold, the threshold is the notification power value, a value obtained by subtracting the threshold from the transmission power value is a correction power value, Processing for transmitting the notification power value and the corrected power value to the communication terminal;
The communication terminal compares the notification power value transmitted from the radio base station with the threshold value;
When the communication terminal is different from the notification power value and the threshold, a process of recognizing the notification power value as a transmission power value of the primary common pilot channel transmitted from the radio base station;
When the communication terminal has the same notification power value and the threshold value, the wireless base station transmits a value obtained by adding the correction power value and the notification power value transmitted from the wireless base station. And processing for recognizing the transmission power value of the primary common pilot channel.

Moreover, the transmission power notification method of the present invention includes:
A communication terminal having a wireless communication function, a radio base station that performs radio communication with the communication terminal and transmits a signal of the primary common pilot channel to the communication terminal, and a radio base station control apparatus that controls the radio base station A transmission power value notification method in a configured communication system,
The wireless base station control device compares a transmission power value set in advance as a transmission power value of the primary common pilot channel with a first threshold value set in advance,
The wireless base station control device, as a result of the comparison, when the transmission power value is greater than or equal to the first threshold, a process of transmitting the transmission power value to the wireless base station as a first notification power value;
When the transmission power value is smaller than the first threshold as a result of the comparison, the radio base station controller sets the first threshold as the first notification power value, and determines the first power from the transmission power value. A value obtained by subtracting the threshold value of 1 as a first correction power value, and transmitting the first notification power value and the first correction power value to the radio base station;
The wireless base station compares the first notification power value transmitted from the wireless base station control device with the first threshold;
The primary common pilot channel transmitted from the radio base station when the first base power value is different from the first threshold value as a result of the comparison. Processing to recognize as the transmission power value of
As a result of the comparison, when the first notification power value and the first threshold are the same, the radio base station adds a value obtained by adding the first correction power value and the first notification power value. Processing for recognizing the transmission power value of the primary common pilot channel transmitted from the radio base station;
The wireless base station compares the recognized transmission power value with a preset second threshold value;
The wireless base station, as a result of the comparison, when the transmission power value is greater than or equal to the second threshold, a process of transmitting the transmission power value as the second notification power value to the communication terminal with the transmission power; ,
If the result of the comparison is that the transmission power value is smaller than the second threshold value, the radio base station sets the second threshold value as the second notification power value, and determines the second notification power value from the transmission power value. A value obtained by subtracting the threshold as a second correction power value, and the second notification power value and the second correction power value are transmitted to the communication terminal with the transmission power;
A process in which the communication terminal compares the second notification power value transmitted from the radio base station with the second threshold;
When the communication terminal determines that the second notification power value is different from the second threshold as a result of the comparison, the communication terminal transmits the second notification power value of the primary common pilot channel transmitted from the radio base station. Processing to recognize as the transmission power value,
When the communication terminal determines that the second notification power value and the second threshold are the same as a result of the comparison, a value obtained by adding the second correction power value and the second notification power value is And processing for recognizing the transmission power value of the primary common pilot channel transmitted from the radio base station.

Moreover, the transmission power notification method of the present invention includes:
A wireless base station that performs wireless communication with a communication terminal having a wireless communication function and transmits a signal of a primary common pilot channel to the communication terminal, a transmission power value notification method for notifying the communication terminal of a transmission power value,
A process of comparing a transmission power value preset as a transmission power value of the primary common pilot channel with a preset threshold;
As a result of the comparison, when the transmission power value is greater than or equal to the threshold value, a process of transmitting the notification power value to the communication terminal using the transmission power value as a notification power value;
As a result of the comparison, when the transmission power value is smaller than the threshold, the threshold is set as the notification power value, a value obtained by subtracting the threshold from the transmission power value is set as a correction power value, and the notification power value and the correction And a process of transmitting a power value to the communication terminal.

Moreover, the transmission power notification method of the present invention includes:
A wireless base station that performs wireless communication with a communication terminal having a wireless communication function and transmits a signal of a primary common pilot channel to the communication terminal, a transmission power value notification method for notifying the communication terminal of a transmission power value,
A process of comparing the first notification power value transmitted from the radio base station controller that controls the radio base station with a preset first threshold value;
As a result of the comparison, when the first notification power value and the first threshold value are different, the first notification power value is recognized as the transmission power value of the primary common pilot channel transmitted from the radio base station. Processing to
As a result of the comparison, if the first notification power value and the first threshold value are the same, the first corrected power value and the first notification power value transmitted from the radio base station controller are obtained. Processing for recognizing the added value as the transmission power value of the primary common pilot channel transmitted from the radio base station;
A process of comparing the recognized transmission power value with a preset second threshold;
As a result of the comparison, when the transmission power value is greater than or equal to the second threshold, a process of transmitting the transmission power value as the second notification power value to the communication terminal with the transmission power;
As a result of the comparison, when the transmission power value is smaller than the second threshold value, the second threshold value is set as the second notification power value, and a value obtained by subtracting the second threshold value from the transmission power value is obtained. A second correction power value, and a process of transmitting the second notification power value and the second correction power value to the communication terminal with the transmission power.

Moreover, the transmission power notification method of the present invention includes:
A transmission power value notification method in which a radio base station controller that controls a radio base station that transmits a signal of a primary common pilot channel to a communication terminal having a radio communication function notifies a transmission power value from the radio base station to the communication terminal Because
A process of comparing a transmission power value set in advance as a transmission power value of the primary common pilot channel with a preset threshold value;
As a result of the comparison, when the transmission power value is greater than or equal to the threshold, a process of transmitting the transmission power value to the radio base station as a notification power value;
As a result of the comparison, when the transmission power value is smaller than the threshold value, the threshold value is set as the notification power value, a value obtained by subtracting the threshold value from the transmission power value is set as a correction power value, and the notification power value and the correction And a process of transmitting a power value to the radio base station.

Moreover, the transmission power notification method of the present invention includes:
A communication terminal having a wireless communication function and configured to be connectable to a wireless base station that transmits a signal of a primary common pilot channel recognizes a transmission power value from the wireless base station,
A process of comparing a notification power value included in a radio control message transmitted from the radio base station with a preset threshold value;
As a result of the comparison, when the notification power value and the threshold value are different, processing for recognizing the notification power value as a transmission power value of the primary common pilot channel transmitted from the radio base station;
As a result of the comparison, when the notification power value and the threshold value are the same, a value obtained by adding the correction power value included in the radio control message transmitted from the radio base station and the notification power value to the radio base station And processing for recognizing the transmission power value of the primary common pilot channel transmitted from the station.

  As described above, in the present invention, the radio base station communicates the transmission power value even if the transmission power value of the preset primary common pilot channel is smaller than the preset value range. Since it is configured to transmit to the terminal, it is possible to prevent wireless interference and wasteful power consumption in the wireless communication system.

It is a figure which shows the transmission power value of Primary CPICH shown by the radio control message prescribed | regulated by standardization. It is a figure which shows 1st Embodiment of the communication system of this invention. It is a figure which shows an example of the internal structure of the base station shown in FIG. It is a figure which shows the structural example of the parameter which shows the own cell information of the radio control message which the radio control message assembly part shown in FIG. 3 assembles. It is a figure which shows the structural example of the parameter which shows the neighbor cell information of the radio control message which the radio control message assembly part shown in FIG. 3 assembles. 6 is a diagram illustrating a configuration example of parameters indicating a range of a transmission power value (Tx Power) of the Primary CPICH illustrated in FIGS. 4 and 5 included in a radio control message assembled by the radio control message assembling unit illustrated in FIG. 3. . FIG. 6 is a diagram illustrating a configuration example of parameters indicating a range of Delta Primary CPICH Tx Power illustrated in FIGS. 4 and 5 included in a radio control message assembled by a radio control message assembling unit illustrated in FIG. 3. It is a figure which shows an example of the internal structure of UE shown in FIG. It is a flowchart for demonstrating the process in the base station shown in FIG. 2 among the transmission power value notification methods in this form. It is a flowchart for demonstrating the process in UE shown in FIG. 2 among the transmission power value notification methods in this form. It is a figure for demonstrating an example of the parameter setting method mentioned above. It is a figure for demonstrating an example of the parameter setting method mentioned above. It is a figure for demonstrating an example of the parameter setting method mentioned above. It is a figure which shows 2nd Embodiment of the communication system of this invention. It is a figure which shows an example of an internal structure of the base station shown in FIG. It is a figure which shows 3rd Embodiment of the communication system of this invention. It is a figure which shows an example of an internal structure of RNC shown in FIG. It is a figure which shows an example of an internal structure of the base station shown in FIG. It is a figure which shows an example of the parameter at the time of extending the setting range of Primary CPICH Tx Power. It is a figure for demonstrating an example of the setting method of the parameter used when a transmission power value is less than the minimum of the setting range of Primary CPICH Tx Power. It is a figure for demonstrating an example of the setting method of the parameter used when a transmission power value is less than the minimum of the setting range of Primary CPICH Tx Power. It is a figure for demonstrating an example of the setting method of the parameter used when a transmission power value is less than the minimum of the setting range of Primary CPICH Tx Power.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 2 is a diagram showing a first embodiment of the communication system of the present invention.

  As shown in FIG. 2, the present embodiment includes a base station 101 and a UE 301. A cell 201 covered by the base station 101 and cells 202 and 203 covered by other base stations (not shown). Adjacent.

  The base station 101 is a radio base station that transmits a radio control message to the UE 301 existing in the cell 201. In this embodiment, the base station 101 is a small radio base station apparatus such as an HNB (Home Node B).

  The UE 301 is a communication terminal that has a radio communication function and receives a radio control message transmitted from the base station 101. Further, the UE 301 may be a mobile communication terminal.

  FIG. 3 is a diagram illustrating an example of an internal configuration of the base station 101 illustrated in FIG.

  As shown in FIG. 3, the base station 101 shown in FIG. 2 includes a memory 110, a transmission power value comparison unit 111, a radio control message assembly unit 112, and a transmission unit 113.

  The memory 110 stores a transmission power value set in advance as a transmission power value of a primary CPICH (primary common pilot channel) that is a reference signal.

  The transmission power value comparison unit 111 compares the transmission power value stored in the memory 110 with a preset threshold value. This threshold is “−10 [dBm]”, which is the lower limit of the range of the transmission power value of the Primary CPICH defined by standardization.

  When the transmission power value stored in the memory 110 is greater than or equal to the threshold “−10 [dBm]” as a result of the comparison by the transmission power value comparison unit 111, the radio control message assembly unit 112 uses the transmission power value as the notification power value. Assemble radio control messages. When the transmission power value stored in the memory 110 is smaller than the threshold “−10 [dBm]”, the threshold “−10 [dBm]” is set as the notification power value, and the threshold is determined from the transmission power value stored in the memory 110. A radio control message is assembled with a value obtained by subtracting “−10 [dBm]” as a supplementary power value (also referred to as a corrected power value). For example, when the transmission power value stored in the memory 110 is “−50 [dBm]”, a value “−40” obtained by subtracting the threshold value “−10 [dBm]” from the transmission power value “−50 [dBm]”. [DBm] ”is the supplementary power value.

  In order to facilitate understanding, a threshold value of “−10 [dBm]”, which is the lower limit of the range of the primary CPICH transmission power value defined in the standardization, is used, but is not limited thereto. For example, it is good also as a value prescribed | regulated with the transmission or reception power value other than another standard and Primary CPICH.

  FIG. 4 is a diagram illustrating a configuration example of parameters indicating own cell information of a radio control message assembled by the radio control message assembling unit 112 illustrated in FIG.

  As shown in FIG. 4, the primary CPICH transmission power value (Primary CPICH Tx Power) is indicated as the notification power value in the information of the own cell (cell 201 in the form shown in FIG. 2). This is specified in 3GPP TS25.331. Further, Delta Primary CPICH Tx Power is shown as a supplementary power value of Primary CPICH. This is a feature of the present invention.

  FIG. 5 is a diagram illustrating a configuration example of parameters indicating neighboring cell information of the radio control message assembled by the radio control message assembling unit 112 illustrated in FIG. 3.

  As shown in FIG. 5, the transmission power value (Primary CPICH Tx) of the Primary CPICH transmitted from the base station covering the neighboring cell is included in the information of the neighboring cell (cell 202 or cell 203 in the form shown in FIG. 2). Power) is shown as the notification power value. This is specified in 3GPP TS25.331. Further, Delta Primary CPICH Tx Power is shown as a supplementary power value of Primary CPICH. This is a feature of the present invention.

  6 is a configuration example of parameters indicating the range of the transmission power value (Tx Power) of the Primary CPICH shown in FIGS. 4 and 5 included in the radio control message assembled by the radio control message assembling unit 112 shown in FIG. FIG.

  As shown in FIG. 6, the range of the transmission power value (Tx Power) of the Primary CPICH shown in FIGS. 4 and 5 is set to “−10 [dBm] to 50 [dBm]”. This is specified in 3GPP TS25.331.

  7 is a diagram illustrating a configuration example of parameters indicating the range of the Delta Primary CPICH Tx Power illustrated in FIGS. 4 and 5 included in the radio control message assembled by the radio control message assembling unit 112 illustrated in FIG. 3. .

  As shown in FIG. 7, the range of Delta Primary CPICH Tx Power shown in FIGS. 4 and 5 is set to “−60 [dBm] to −1 [dBm]”.

  The transmission unit 113 transmits the radio control message assembled by the radio control message assembly unit 112 to the UE 301 with the transmission power indicated by the transmission power value stored in the memory 110.

  Here, the radio control message is broadcast information broadcast by the base station. The broadcast information includes at least one of own cell information and neighboring cell information. Specific examples thereof will be described below.

Specific example of broadcast information including information of own cell:
・ System information Block Type 5
・ System information Block Type 5 bis
・ System information Block Type 6
Specific examples of broadcast information including neighbor cell information:
・ System information Block Type 11
Further, the radio control message may be a Measurement Control message defined in 3GPP TS25.331. In this case, after the RRC Connection is established between the communication terminal and the base station, the base station transmits a Measurement Control message to the communication terminal. This Measurement Control message may include at least one of the information on the own cell and the information on neighboring cells.

  FIG. 8 is a diagram illustrating an example of an internal configuration of the UE 301 illustrated in FIG.

  As shown in FIG. 8, the UE 301 shown in FIG. 2 includes a notification power value comparison unit 310, an extraction unit 311, a calculation unit 312 and a recognition unit 313.

  The notification power value comparison unit 310 compares the notification power value transmitted from the base station 101 with the threshold used in the comparison in the transmission power value comparison unit 111. Moreover, the notification power value comparison unit 310 outputs the notification power value to the recognition unit 313 when the notification power value and the threshold value are different as a result of the comparison. Moreover, the notification power value comparison unit 310 outputs the radio control message to the extraction unit 311 when the notification power value and the threshold value are the same as a result of the comparison. Here, the notification power value comparison unit 310 may output the radio control message and the notification power value to the extraction unit 311.

  When the wireless control message is output from the notification power value comparison unit 310, the extraction unit 311 extracts the notification power value and the above-described supplementary power value from the wireless control message. Alternatively, when the wireless control message and the notification power value are output from the notification power value comparison unit 310, the extraction unit 311 extracts the supplementary power value described above from the wireless control message. In addition, the extraction unit 311 outputs the extracted supplementary power value and notification power value to the calculation unit 312.

  When the notification power value and the supplementary power value are output from the extraction unit 311, the calculation unit 312 adds the supplementary power value to the notification power value. In addition, the calculation unit 312 outputs the added calculated value to the recognition unit 313.

  When the notification power value is output from the notification power value comparison unit 310, the recognition unit 313 recognizes the notification power value as the transmission power value of the Primary CPICH. In addition, when a calculation value is output from the calculation unit 312, the recognition unit 313 recognizes the calculation value as the transmission power value of the Primary CPICH.

  The transmission power value notification method in this embodiment will be described below. First, processing in the base station 101 shown in FIG. 2 will be described.

  FIG. 9 is a flowchart for explaining processing in base station 101 shown in FIG. 2 in the transmission power value notification method according to this embodiment.

  First, in step 1, it is determined whether the cell information is own cell information or neighboring cell information. This is to determine whether the transmission power value of the Primary CPICH notified to the UE 301 is transmitted from the base station 101 of the own cell or from the base station of the neighboring cell. .

  When it is determined that the cell information is the own cell information, the transmission power value comparison unit 111 compares the transmission power value transmitted to the own cell stored in the memory 110 and a preset threshold value in step 2. Is done. As described above, this threshold is “−10 [dBm]” which is the lower limit of the range of the transmission power value of the Primary CPICH. Note that this transmission power value may be set from the host device of the base station 101 and written to the memory 110, or may be written to the memory 110 by an operator operating the base station 101. In addition, the base station 101 may be obtained from a database in which other user information is stored and written in the memory 110 at a predetermined timing (for example, at startup).

  Then, the radio control message assembly unit 112 assembles a radio control message based on the comparison result by the transmission power value comparison unit 111. Specifically, the radio control message is assembled as follows.

  If the transmission power value stored in the memory 110 is greater than or equal to the threshold value “−10 [dBm]” as a result of the comparison by the transmission power value comparison unit 111, the transmission power value in Step 3 is the Primary explained in FIG. 4. A radio control message that is set to CPICH Tx Power and nothing is set is assembled in the Delta Primary CPICH Tx Power described in FIG. At this time, “0” may be set in Delta Primary CPICH Tx Power.

  On the other hand, if the transmission power value stored in the memory 110 is smaller than the threshold value “−10 [dBm]” as a result of the comparison by the transmission power value comparison unit 111, the threshold value “−10 [dBm] is determined in step 4. ] ”Is set to the Primary CPICH Tx Power described in FIG. 4, and a value obtained by subtracting the threshold“ −10 [dBm] ”from the transmission power value is set to the Delta Primary CPICH Tx Power described in FIG. A control message is assembled.

  Then, the radio control message assembled in step 3 or step 4 is transmitted from the transmission unit 113 to the UE 301.

  On the other hand, if it is determined in step 1 that the cell information is neighboring cell information, the transmission power value to be transmitted to the neighboring cell stored in the memory 110 and a preset threshold value are transmitted in step 5. The power value comparison unit 111 compares the values. As described above, this threshold is “−10 [dBm]” which is the lower limit of the range of the transmission power value of the Primary CPICH. Note that this transmission power value may be set from the host device of the base station 101 and written to the memory 110, or may be written to the memory 110 by an operator operating the base station 101. In addition, the base station 101 may be obtained from a database in which other user information is stored and written in the memory 110 at a predetermined timing (for example, at startup).

  Then, the radio control message assembly unit 112 assembles a radio control message based on the comparison result by the transmission power value comparison unit 111. Specifically, the radio control message is assembled as follows.

  If the transmission power value stored in the memory 110 is greater than or equal to the threshold value “−10 [dBm]” as a result of the comparison by the transmission power value comparison unit 111, the transmission power value in Step 6 is the Primary explained in FIG. A radio control message that is set to CPICH Tx Power and nothing is set is assembled in the Delta Primary CPICH Tx Power described in FIG. At this time, “0” may be set in Delta Primary CPICH Tx Power.

  On the other hand, if the transmission power value stored in the memory 110 is smaller than the threshold value “−10 [dBm]” as a result of the comparison by the transmission power value comparison unit 111, the threshold value “−10 [dBm] is set in step 7. ] ”Is set to the Primary CPICH Tx Power described in FIG. 5, and a value obtained by subtracting the threshold“ −10 [dBm] ”from the transmission power value is set to the Delta Primary CPICH Tx Power described in FIG. A control message is assembled.

  Then, the radio control message assembled in step 6 or step 7 is transmitted from the transmission unit 113 to the UE 301.

  Next, the process in UE301 shown in FIG. 2 is demonstrated among the transmission power value notification methods in this form.

  FIG. 10 is a flowchart for explaining the processing in UE 301 shown in FIG. 2 in the transmission power value notification method in this embodiment.

  First, in step 11, in the radio control message transmitted from the base station 101, the own cell information message and the neighboring cell information message are processed separately. In the case of the message of own cell information, parameters as shown in FIG. 4 are set. In the case of the neighbor cell information message, parameters as shown in FIG. 5 are set.

  In the case of the own cell information, the notification power value comparison unit 310 compares the primary CPICH Tx Power, which is the notification power value included in the radio control message, with the threshold value in step 12. This threshold is “−10 [dBm]” that is the lower limit of the range of the transmission power value of the Primary CPICH, which is the same as that used in the base station 101.

  As a result of the comparison by the notification power value comparison unit 310, when the Primary CPICH Tx Power is different from the threshold “−10 [dBm]”, the Primary CPICH Tx Power is output to the recognition unit 313. Then, the recognition unit 313 recognizes in step 13 that the Primary CPICH Tx Power output from the notification power value comparison unit 310 is the transmission power value of the Primary CPICH transmitted from the base station 101 to the own cell. The

  On the other hand, if the result of comparison by the notification power value comparison unit 310 is the same as the Primary CPICH Tx Power and the threshold “−10 [dBm]”, the radio control message is output to the extraction unit 311. Here, the notification power value comparison unit 310 may output the radio control message and the Primary CPICH Tx Power to the extraction unit 311.

  Then, the extraction unit 311 extracts the Delta Primary CPICH Tx Power, which is a supplementary power value, from the radio control message output from the notification power value comparison unit 310. In step 14, the extraction unit 311 determines whether the Delta Primary CPICH Tx Power does not exist (cannot be extracted) or whether “0” is set in the Delta Primary CPICH Tx Power.

  If it is determined that the Delta Primary CPICH Tx Power does not exist (cannot be extracted), or “0” is set in the Delta Primary CPICH Tx Power, the process of Step 13 is performed.

  On the other hand, when it is determined that Delta Primary CPICH Tx Power exists (can be extracted) and Delta Primary CPICH Tx Power is set to a value other than “0”, Primary CPICH Tx Power and Delta Primary CPICH and x Is output to the calculation unit 312.

  Then, the Delta Primary CPICH Tx Power is added to the Primary CPICH Tx Power output from the extraction unit 311 by the calculation unit 312. The added calculated value is output from the calculation unit 312 to the recognition unit 313.

  Then, the recognition unit 313 recognizes in step 15 that the calculation value output from the calculation unit 312 is the transmission power value of the Primary CPICH transmitted from the base station 101 to the own cell.

  On the other hand, when processing is performed as neighboring cell information in step 11, the primary CPICH Tx Power that is the notification power value included in the radio control message and the threshold are compared by the notification power value comparison unit 310 in step 16. This threshold is “−10 [dBm]” that is the lower limit of the range of the transmission power value of the Primary CPICH, which is the same as that used in the base station 101.

  As a result of the comparison by the notification power value comparison unit 310, when the Primary CPICH Tx Power is different from the threshold “−10 [dBm]”, the Primary CPICH Tx Power is output to the recognition unit 313. Then, the recognition unit 313 recognizes in step 17 that the Primary CPICH Tx Power output from the notification power value comparison unit 310 is the transmission power value of the Primary CPICH transmitted from the base station 101 to the neighboring cell. The

  On the other hand, if the result of comparison by the notification power value comparison unit 310 is the same as the Primary CPICH Tx Power and the threshold “−10 [dBm]”, the radio control message is output to the extraction unit 311. Here, the notification power value comparison unit 310 may output the radio control message and the Primary CPICH Tx Power to the extraction unit 311.

  Then, the extraction unit 311 extracts the Delta Primary CPICH Tx Power, which is a supplementary power value, from the radio control message output from the notification power value comparison unit 310. Here, in step 18, the extraction unit 311 determines whether the Delta Primary CPICH Tx Power does not exist (cannot be extracted) or whether “0” is set in the Delta Primary CPICH Tx Power.

  If it is determined that the Delta Primary CPICH Tx Power does not exist (cannot be extracted) or that “0” is set in the Delta Primary CPICH Tx Power, the process of step S17 is performed.

  On the other hand, when it is determined that Delta Primary CPICH Tx Power exists (can be extracted) and Delta Primary CPICH Tx Power is set to a value other than “0”, Primary CPICH Tx Power and Delta Primary CPICH and x Is output to the calculation unit 312.

  Then, the Delta Primary CPICH Tx Power is added to the Primary CPICH Tx Power output from the extraction unit 311 by the calculation unit 312. The added calculated value is output from the calculation unit 312 to the recognition unit 313.

  Then, the recognition unit 313 recognizes in step 19 that the calculation value output from the calculation unit 312 is the transmission power value of the Primary CPICH transmitted from the base station 101 to the neighboring cell.

  The parameter setting method described above will be described below.

  FIGS. 11-13 is a figure for demonstrating an example of the parameter setting method mentioned above. This parameter setting method is described in terms of TS25.331.

  As shown in FIGS. 11 and 12, the parameter Delta Primary CPICH Tx Power is effective only when the parameter Primary CPICH Tx Power is set and the value of the parameter Primary CPICH Tx Power is “−10 [dBm]”. It is set. Otherwise, setting of the parameter Delta Primary CPICH Tx Power is not necessary.

  When the parameter Primary CPICH Tx Power is not set, the value of Primary CPICH Tx Power corresponding to the previously set PRACH System Information is applied (see TS25.331).

  Also, as shown in FIG. 13, the parameter Delta Primary CPICH Tx Power is a setting that is valid only when the parameter Primary CPICH Tx Power is set and the value of Primary CPICH Tx Power is “−10 [dBm]”. It has become. Otherwise, setting of the parameter Delta Primary CPICH Tx Power is not necessary.

  Note that the parameter Primary CPICH Tx Power is a parameter required in the calculation of Pathloss. If this parameter is not set, it is a wireless communication measurement condition that does not require setting the parameter Primary CPICH Tx Power in the corresponding neighboring cell. Yes (see TS25.331).

The parameter Delta Primary CPICH Tx Power shown in FIG. 13 indicates the 10.3.6.61x chapter shown in FIG.
(Second Embodiment)
FIG. 14 is a diagram showing a second embodiment of the communication system of the present invention.

  As shown in FIG. 14, the present embodiment includes base stations 101 and 102 and UEs 301 and 302, a cell 201 covered by the base station 101, a cell 202 covered by the base station 102, and other bases A cell 203 covered by a station (not shown) is adjacent.

  The base station 101 is a radio base station that transmits a radio control message to the base station 102 and the UE 301 existing in the cell 201.

  The base station 102 is a radio base station that transmits a radio control message to the base station 101 and the UE 302 existing in the cell 202.

  The UE 301 is a communication terminal that has a radio communication function and receives a radio control message transmitted from the base station 101. Further, the UE 301 may be a mobile communication terminal.

  The UE 302 is a communication terminal that has a radio communication function and receives a radio control message transmitted from the base station 102. Further, the UE 302 may be a mobile communication terminal.

  FIG. 15 is a diagram illustrating an example of an internal configuration of the base station 102 illustrated in FIG.

  As shown in FIG. 15, the base station 102 shown in FIG. 14 includes a memory 120, a transmission power value comparison unit 121, a radio control message assembly unit 122, a transmission unit 123, a notification power value comparison unit 124, An extraction unit 125, a calculation unit 126, and a recognition unit 127 are provided.

  The memory 120 is the same as the memory 110 shown in FIG.

  The transmission power value comparison unit 121 compares the transmission power value output from the recognition unit 127 with a preset threshold in addition to the functions of the transmission power value comparison unit 111 illustrated in FIG. This threshold is “−10 [dBm]”, which is the lower limit of the range of the transmission power value of the Primary CPICH defined by standardization.

  The radio control message assembly unit 122 is the same as the radio control message assembly unit 112 shown in FIG.

  The transmission unit 123 is the same as the transmission unit 113 shown in FIG.

  The notification power value comparison unit 124 is the same as the notification power value comparison unit 310 shown in FIG.

  The extraction unit 125 is the same as the extraction unit 311 shown in FIG.

  The calculation unit 126 is the same as the calculation unit 312 illustrated in FIG.

  The recognizing unit 127 outputs the recognized transmission power value to the transmission power value comparing unit 121 in addition to the function of the recognizing unit 313 illustrated in FIG.

  By adopting such a configuration, the base station 102 can recognize the transmission power value from the base station 101 which is an adjacent base station covering the cell 201 adjacent to the cell 202, and from the recognized base station 101 Can be notified to the UE 302. Thereby, UE302 can recognize the transmission power value from the base station 101 of the neighboring cell 201. FIG.

Needless to say, the base station 101 may have the same configuration as the base station 102.
(Third embodiment)
FIG. 16 is a diagram showing a third embodiment of a communication system according to the present invention.

  As shown in FIG. 16, the present embodiment is composed of an RNC 400, a base station 103, and a UE 301. A cell 201 covered by the base station 101, a cell 202 covered by another base station (not shown), 203 is adjacent.

  The RNC 400 is a radio base station control device that controls the base station 103. Further, the RNC 400 controls the base station 103 by using an NBAP (Node B Application Part) signal, which is a radio link setting procedure, as a transmission message to be transmitted to the base station 103.

  The base station 103 is a radio base station that transmits a radio control message to the UE 301 existing in the cell 201. In this embodiment, the base station 103 is a general radio base station apparatus such as an NB (Node B).

  The UE 301 is a communication terminal that has a radio communication function and receives a radio control message transmitted from the base station 103. Further, the UE 301 may be a mobile communication terminal.

  FIG. 17 is a diagram showing an example of an internal configuration of RNC 400 shown in FIG.

  As illustrated in FIG. 17, the RNC 400 illustrated in FIG. 16 includes a memory 410, a transmission power value comparison unit 411, a transmission message assembly unit 412, and a transmission unit 413.

  The memory 410 stores a transmission power value set in advance as a transmission power value of the Primary CPICH.

  The transmission power value comparison unit 411 compares the transmission power value stored in the memory 410 with a preset threshold value. This threshold value is a lower limit value (hereinafter referred to as a first threshold value) of a range in which the transmission power value can be set as the notification power value in the NBAP signal described above.

  When the transmission power value stored in the memory 410 is equal to or higher than the first threshold as a result of the comparison by the transmission power value comparison unit 111, the transmission message assembling unit 412 uses the transmission power value as the first notification power value as an NBAP signal. Assemble. Further, when the transmission power value stored in the memory 410 is smaller than the first threshold value, the first threshold value is set as the notification power value, and a value obtained by subtracting the first threshold value from the transmission power value stored in the memory 410 is obtained. Assemble the NBAP signal as the first supplemental power value. For example, when the transmission power value stored in the memory 410 is “−100 [dBm]” and the first threshold is “−10 [dBm]”, the transmission power value “−100 [dBm]” A value “−90 [dBm]” obtained by subtracting the first threshold “−10 [dBm]” is the first supplementary power value.

  Here, the first notification power value is a parameter in the NBAP signal corresponding to the Primary CPICH Tx Power described in the first embodiment, and the first supplementary power value is the same as that in the first embodiment. This is a parameter in the NBAP signal corresponding to the described Delta Primary CPICH Tx Power.

  The transmission unit 413 transmits the NBAP signal assembled by the transmission message assembly unit 412 to the base station 103.

  18 is a diagram illustrating an example of an internal configuration of the base station 103 illustrated in FIG.

  As shown in FIG. 18, the base station 103 shown in FIG. 16 includes a notification power value comparison unit 134, a recognition unit 130, a transmission power value comparison unit 131, a radio control message assembly unit 132, a transmission unit 133, Is provided.

  The notification power value comparison unit 134 compares the first notification power value with the first threshold value from the NBAP signal transmitted from the RNC 400. Further, the notification power value comparison unit 134 outputs the comparison result to the recognition unit 130.

  Based on the comparison result output from the notification power value comparison unit 134, the recognition unit 130 recognizes the transmission power value using the first notification power value and the first supplementary power value. A specific recognition method will be described below.

  When the comparison result indicates that the first notification power value is different from the first threshold value, the first notification power value is recognized as the transmission power value. On the other hand, when the comparison result indicates that the first notification power value and the first threshold value are the same, a value obtained by adding the first supplementary power value to the first notification power value is recognized as the transmission power value.

  Further, the recognition unit 130 outputs the recognized transmission power value to the transmission unit 133 and the transmission power value comparison unit 131.

  The transmission power value comparison unit 131 compares the transmission power value output from the recognition unit 130 with a preset second threshold value. The second threshold is “−10 [dBm]”, which is the lower limit of the range of the transmission power value of the Primary CPICH defined by standardization. Further, the transmission power value comparison unit 131 outputs the comparison result to the radio control message assembly unit 132.

  When the transmission power value output from the recognition unit 130 is equal to or greater than the second threshold “−10 [dBm]” as a result of the comparison by the transmission power value comparison unit 131, the radio control message assembly unit 132 transmits the transmission power value. Is assembled as a second notification power value. When the transmission power value output from the recognition unit 130 is smaller than the second threshold “−10 [dBm]”, the second threshold “−10 [dBm]” is set as the second notification power value, A radio control message is assembled using a value obtained by subtracting the second threshold “−10 [dBm]” from the transmission power value output from the recognition unit 130 as a second supplementary power value. For example, when the transmission power value output from the recognition unit 130 is “−100 [dBm]”, a value “−” obtained by subtracting the threshold “−10 [dBm]” from the transmission power value “−100 [dBm]”. 90 [dBm] ”is the second supplementary power value.

  The transmission unit 133 transmits the radio control message assembled by the radio control message assembly unit 132 to the UE 301 with the transmission power indicated by the transmission power value output from the recognition unit 130.

  As described above, in the third embodiment, the notification of the transmission power value between the RNC 400 and the base station 103 is performed by using the existing signal (NBAP in this embodiment) between the base station 103 and the UE 301. A device similar to the notification of the transmission power value in between is applied. As a result, the existing signal can be set to be lower than the specified setting range.

  In the first to third embodiments, a method of extending the setting range of the Primary CPICH Tx Power is also conceivable.

  FIG. 19 is a diagram illustrating an example of parameters when the setting range of the Primary CPICH Tx Power is extended.

  As shown in FIG. 19, the Primary CPICH Tx Power setting range may be extended from −70 [dBm] to 50 [dBm].

  Further, when the transmission power value falls below the lower limit of the setting range of Primary CPICH Tx Power, it may be set using other parameters.

  20-22 is a figure for demonstrating an example of the setting method of the parameter used when a transmission power value is less than the minimum of the setting range of Primary CPICH Tx Power.

  As shown in FIGS. 20 and 21, the parameter Primary CPICH Tx Power Extension is effective only when the parameter Primary CPICH Tx Power is set and the value of the parameter Primary CPICH Tx Power is “−10 [dBm]”. It is set. Otherwise, the setting of the parameter Primary CPICH Tx Power Extension is not necessary. The setting range of the parameter Primary CPICH Tx Power Extension is −70 [dBm] to 50 [dBm].

  Also, as shown in FIG. 22, the parameter Primary CPICH Tx Power Extension is valid only when the parameter Primary CPICH Tx Power is set and the value of the parameter Primary CPICH Tx Power is “−10 [dBm]”. It has become. Otherwise, the setting of the parameter Primary CPICH Tx Power Extension is not necessary. The setting range of the parameter Primary CPICH Tx Power Extension is −70 [dBm] to 50 [dBm].

  Note that the parameter Primary CPICH Tx Power Extension shown in FIG. 22 indicates the 10.3.6.61x chapter shown in FIG.

The basic configuration of the embodiment described above is a configuration for a WCDMA (Wideband Code Division Multiple Access) system compliant with TS25.331. Regarding the setting method of the minimum transmission power value, E-UTRAN (TS36.331) Is also applicable.
(Fourth embodiment)
In the above embodiment, a small radio base station apparatus such as an HNB (Home Node B) having a femto cell is targeted.

  On the other hand, in the present embodiment, a base station apparatus having a macro cell is targeted. In this case, similarly to the above embodiment, for example, the above parameters may be set in a radio control message (System Information) transmitted (broadcast) to the macro cell.

  As described above, the present invention has the following effects.

  The first effect is that a small transmission power can be set in a small radio base station because the setting unit has a setting means for setting the value below the minimum value of the Primary CPICH Tx Power.

  The second effect is that since the setting means for setting lower than the minimum value of Primary CPICH Tx Power is provided, a small transmission power can be set in the radio base station in the saving mode.

  The third effect is that since the radio base station can transmit a setting value lower than the minimum value of Primary CPICH Tx Power to the communication terminal, the communication terminal can set the transmission power setting value and the transmission power value actually transmitted by the radio base station. It is possible to know.

  The fourth effect is that the parameter Delta Primary CPICH Tx Power can be set by using the parameter Delta Primary CPICH Tx Power which is effective only when the existing parameter Primary CPICH Tx Power is the minimum value. It is possible to reduce the impact of the minimum power difference given to existing wireless communication nodes (for example, mobile terminals, small wireless base stations, etc.) that cannot be recognized.

  The fifth effect is that the communication terminal can be notified of a setting value that is lower than the minimum value of the Primary CPICH Tx Power transmitted by the radio base station, so that it is possible to suppress the uplink transmission power transmitted by the communication terminal. Power saving can be achieved.

  In the above-described embodiment, when the transmission power value and the threshold value are the same, the correction power value is set to 0 (zero), and the correction power value and the notification power value are transmitted to the communication terminal. It may not be set. The communication terminal recognizes that the corrected power value is 0 when the parameter of the corrected power value is not set.

  In the above-described embodiment, the processes of the base stations 101 to 103, the UE 301, and the RNC 400 described above may be performed by logic circuits prepared according to the purpose. In addition, a program in which processing contents are described as a procedure is recorded on a recording medium that can be read by the base stations 101 to 103, the UE 301, and the RNC 400, and the program recorded on the recording medium is recorded on the base stations 101 to 103, the UE 301, and the RNC 400. May be read and executed respectively. The recording media that can be read by the base stations 101 to 103, the UE 301, and the RNC 400 include transferable recording media such as a floppy disk (registered trademark), a magneto-optical disk, a DVD, and a CD, as well as the base stations 101 to 103 and the UE 301. In addition, it indicates a memory such as a ROM and a RAM, an HDD, and the like built in each of the RNC 400. The programs recorded on the recording medium are read by the base stations 101 to 103, the UE 301 and the CPU (not shown) in the RNC 400, respectively, and the same processing as described above is performed under the control of the CPU. Here, the CPU operates as a computer that executes a program read from a recording medium on which the program is recorded.

  Furthermore, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention described above.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2009-106823 for which it applied on April 24, 2009, and takes in those the indications of all here.

Claims (19)

In a communication system composed of a communication terminal and a radio base station that transmits a reference signal to the communication terminal,
When the transmission power value preset as the transmission power value of the reference signal is smaller than a preset threshold, the radio base station uses the threshold as a notification power value, and determines the threshold from the transmission power value. A value obtained by subtracting is used as a corrected power value, and the notification power value and the corrected power value are transmitted to the communication terminal,
The communication terminal receives the notification power value and the corrected power value. The communication system according to claim 1,
When the transmission power value and the threshold are the same, the radio base station sets the correction power value to 0, and transmits the correction power value and the notification power value to the communication terminal with the transmission power. system. The communication system according to claim 1,
The radio base station transmits the notification power value and the corrected power value to a neighboring radio base station covering a cell adjacent to the cell covered by the radio base station,
The neighboring radio base station recognizes the notification power value as a transmission power value of the reference signal transmitted from the radio base station when the notification power value transmitted from the radio base station is larger than the threshold. When the notification power value transmitted from the radio base station and the threshold value are the same, the value obtained by adding the correction power value and the notification power value transmitted from the radio base station is the radio base station. A communication system that recognizes the transmission power value of the reference signal transmitted from the communication system. The communication system according to claim 1,
The communication terminal uses the notification power value as the transmission power value of the reference signal transmitted from the radio base station, even if the notification power value transmitted from the radio base station and the threshold value are the same. Recognize communication system. In the communication system according to any one of claims 1 to 4,
A communication system, wherein the reference signal is a primary common pilot channel. A communication terminal having a wireless communication function, a radio base station that performs radio communication with the communication terminal and transmits a signal of the primary common pilot channel to the communication terminal, and a radio base station control apparatus that controls the radio base station In the configured communication system,
When the transmission power value preset as the transmission power value of the primary common pilot channel is greater than or equal to a first threshold set in advance, the radio base station control device notifies the transmission power value to the first notification. When the transmission power value is transmitted to the radio base station as a power value, and the transmission power value is smaller than the first threshold, the first threshold is set as the first notification power value, and the first power is calculated from the transmission power value. A value obtained by subtracting the threshold is set as a first correction power value, and the first notification power value and the first correction power value are transmitted to the radio base station,
When the first notification power value transmitted from the radio base station control device is different from the first threshold, the radio base station transmits the first notification power value from the radio base station. When the first notification power value transmitted from the radio base station controller is the same as the first threshold, the radio base station controller recognizes the transmission power value of the primary common pilot channel as A value obtained by adding the transmitted first correction power value and the first notification power value is recognized as a transmission power value of the primary common pilot channel transmitted from the radio base station, and the recognized transmission If the power value is greater than or equal to a preset second threshold value, the transmission power value is transmitted to the communication terminal as the second notification power value with the transmission power, and the transmission power value is the second power value. When smaller than a threshold value, the second notification power value is set as the second notification power value, a value obtained by subtracting the second threshold value from the transmission power value is set as a second correction power value, and the second notification power value is set. Transmitting the value and the second corrected power value to the communication terminal with the transmission power,
When the second notification power value transmitted from the radio base station is different from the second threshold, the communication terminal transmits the second notification power value from the radio base station. When the second notification power value recognized as the transmission power value of the common pilot channel and transmitted from the radio base station is the same as the second threshold, the second power transmitted from the radio base station A communication system for recognizing a value obtained by adding the corrected power value and the second notification power value as a transmission power value of the primary common pilot channel transmitted from the radio base station. A radio base station that performs radio communication with a communication terminal having a radio communication function and transmits a signal of a primary common pilot channel to the communication terminal,
A memory for storing a transmission power value set in advance as a transmission power value of the primary common pilot channel;
A transmission power value comparison unit that compares the transmission power value stored in the memory with a preset threshold value;
As a result of comparison in the transmission power value comparison unit, when the transmission power value is equal to or greater than the threshold value, the transmission power value is set as a notification power value, and when the transmission power value is smaller than the threshold value, the threshold value is notified. A radio control message assembling unit that assembles a radio control message including the notification power value and the correction power value, with a power value, a value obtained by subtracting the threshold from the transmission power value as a correction power value;
A radio base station comprising: a radio control message assembled by the radio control message assembly unit; and a transmission unit that transmits the radio control message to the communication terminal with the transmission power. In the radio base station according to claim 7,
The radio control message assembling unit is a radio base station that sets 0 as the correction power value when the transmission power value and the threshold value are the same as a result of comparison in the transmission power value comparison unit. In the radio base station according to claim 7,
The transmitter transmits the radio control message to a neighboring radio base station covering a cell adjacent to a cell covered by the radio base station;
When the radio control message is transmitted from the neighboring radio base station, a notification power value comparison unit that compares the notification power value included in the transmitted radio control message with the threshold value;
As a result of comparison in the notification power value comparison unit, when the notification power value and the threshold value are different, the notification power value is recognized as a transmission power value of the primary common pilot channel transmitted from the neighboring radio base station, When the notification power value and the threshold are the same, transmission of the primary common pilot channel transmitted from the neighboring radio base station is a value obtained by adding the correction power value and the notification power value included in the radio control message. A radio base station having a recognition unit that recognizes the power value. A radio base station that performs radio communication with a communication terminal having a radio communication function and transmits a signal of a primary common pilot channel to the communication terminal,
A notification power value comparison unit that compares the first notification power value transmitted from the radio base station control device that controls the radio base station with a preset first threshold value;
The primary common pilot channel transmitted from the radio base station when the first notification power value is different from the first threshold as a result of comparison in the notification power value comparison unit. When the first notification power value and the first threshold value are the same, the first correction power value and the first notification power transmitted from the radio base station control device are recognized. A recognition unit for recognizing a value obtained by adding a value as a transmission power value of the primary common pilot channel transmitted from the radio base station;
A transmission power value comparison unit that compares the transmission power value recognized by the recognition unit with a preset second threshold;
If the transmission power value is greater than or equal to the second threshold as a result of the comparison in the transmission power value comparison unit, the transmission power value is set as a second notification power value, and the transmission power value is greater than the second threshold. If the second notification power value is smaller, the second notification power value is set as the second notification power value, and a value obtained by subtracting the second threshold value from the transmission power value is set as a second correction power value. A radio control message assembling unit that assembles a radio control message including the second correction power value;
A radio base station comprising: a radio control message assembled by the radio control message assembly unit; and a transmission unit that transmits the radio control message to the communication terminal with the transmission power. A radio base station control apparatus that controls a radio base station that transmits a signal of a primary common pilot channel to a communication terminal having a radio communication function,
A memory for storing a transmission power value set in advance as a transmission power value of the primary common pilot channel;
A transmission power value comparison unit that compares the transmission power value stored in the memory with a preset threshold value;
As a result of comparison in the transmission power value comparison unit, when the transmission power value is equal to or greater than the threshold value, the transmission power value is set as a notification power value, and when the transmission power value is smaller than the threshold value, the threshold value is notified. A transmission message assembling unit that assembles a transmission message including the notification power value and the correction power value, with a power value, a value obtained by subtracting the threshold value from the transmission power value as a correction power value,
A radio base station control apparatus comprising: a transmission unit that transmits the transmission message assembled by the transmission message assembly unit to the radio base station. A communication terminal having a wireless communication function and configured to be connectable to a wireless base station that transmits a primary common pilot channel signal,
A notification power value comparison unit that compares a notification power value included in a radio control message transmitted from the radio base station with a preset threshold;
As a result of comparison in the notification power value comparison unit, when the notification power value and the threshold value are the same, an extraction unit that extracts a correction power value from the radio control message;
A calculation unit that adds the notification power value to the corrected power value extracted by the extraction unit;
As a result of comparison in the notification power value comparison unit, when the notification power value and the threshold value are different, the notification power value is recognized as a transmission power value of the primary common pilot channel transmitted from the radio base station, A communication terminal comprising: a recognition unit that recognizes a value calculated by the calculation unit as a transmission power value of the primary common pilot channel transmitted from the radio base station when the notification power value and the threshold value are the same. The communication terminal according to claim 12,
The recognition unit, as a result of the comparison in the notification power value comparison unit, even if the notification power value and the threshold are the same, the recognition power value of the primary common pilot channel transmitted from the radio base station A communication terminal that is recognized as a transmission power value. A transmission power value notification method in a communication system comprising a communication terminal having a wireless communication function and a radio base station that performs radio communication with the communication terminal and transmits a signal of a primary common pilot channel to the communication terminal. ,
A process in which the radio base station compares a transmission power value set in advance as a transmission power value of the primary common pilot channel with a preset threshold value;
The wireless base station, as a result of the comparison, when the transmission power value is greater than or equal to the threshold value, the transmission power value as a notification power value, processing to transmit the notification power value to the communication terminal,
The wireless base station, as a result of the comparison, if the transmission power value is smaller than the threshold, the threshold is the notification power value, a value obtained by subtracting the threshold from the transmission power value is a correction power value, Processing for transmitting the notification power value and the corrected power value to the communication terminal;
The communication terminal compares the notification power value transmitted from the radio base station with the threshold value;
When the communication terminal is different from the notification power value and the threshold, a process of recognizing the notification power value as a transmission power value of the primary common pilot channel transmitted from the radio base station;
When the communication terminal has the same notification power value and the threshold value, the wireless base station transmits a value obtained by adding the correction power value and the notification power value transmitted from the wireless base station. A transmission power value notification method comprising: recognizing the transmission power value of the primary common pilot channel. A communication terminal having a wireless communication function, a radio base station that performs radio communication with the communication terminal and transmits a signal of the primary common pilot channel to the communication terminal, and a radio base station control apparatus that controls the radio base station A transmission power value notification method in a configured communication system,
The wireless base station control device compares a transmission power value set in advance as a transmission power value of the primary common pilot channel with a first threshold value set in advance,
The wireless base station control device, as a result of the comparison, when the transmission power value is greater than or equal to the first threshold, a process of transmitting the transmission power value to the wireless base station as a first notification power value;
When the transmission power value is smaller than the first threshold as a result of the comparison, the radio base station controller sets the first threshold as the first notification power value, and determines the first power from the transmission power value. A value obtained by subtracting the threshold value of 1 as a first correction power value, and transmitting the first notification power value and the first correction power value to the radio base station;
The wireless base station compares the first notification power value transmitted from the wireless base station control device with the first threshold;
The primary common pilot channel transmitted from the radio base station when the first base power value is different from the first threshold value as a result of the comparison. Processing to recognize as the transmission power value of
As a result of the comparison, when the first notification power value and the first threshold are the same, the radio base station adds a value obtained by adding the first correction power value and the first notification power value. Processing for recognizing the transmission power value of the primary common pilot channel transmitted from the radio base station;
The wireless base station compares the recognized transmission power value with a preset second threshold value;
The wireless base station, as a result of the comparison, when the transmission power value is greater than or equal to the second threshold, a process of transmitting the transmission power value as the second notification power value to the communication terminal with the transmission power; ,
If the result of the comparison is that the transmission power value is smaller than the second threshold value, the radio base station sets the second threshold value as the second notification power value, and determines the second notification power value from the transmission power value. A value obtained by subtracting the threshold as a second correction power value, and the second notification power value and the second correction power value are transmitted to the communication terminal with the transmission power;
A process in which the communication terminal compares the second notification power value transmitted from the radio base station with the second threshold;
When the communication terminal determines that the second notification power value is different from the second threshold as a result of the comparison, the communication terminal transmits the second notification power value of the primary common pilot channel transmitted from the radio base station. Processing to recognize as the transmission power value,
When the communication terminal determines that the second notification power value and the second threshold are the same as a result of the comparison, a value obtained by adding the second correction power value and the second notification power value is And a process for recognizing the transmission power value of the primary common pilot channel transmitted from a radio base station. A wireless base station that performs wireless communication with a communication terminal having a wireless communication function and transmits a signal of a primary common pilot channel to the communication terminal, a transmission power value notification method for notifying the communication terminal of a transmission power value,
A process of comparing a transmission power value preset as a transmission power value of the primary common pilot channel with a preset threshold;
As a result of the comparison, when the transmission power value is greater than or equal to the threshold value, a process of transmitting the notification power value to the communication terminal as the transmission power value,
As a result of the comparison, when the transmission power value is smaller than the threshold value, the threshold value is set as the notification power value, a value obtained by subtracting the threshold value from the transmission power value is set as a correction power value, and the notification power value and the correction A transmission power value notification method comprising: transmitting a power value to the communication terminal. A wireless base station that performs wireless communication with a communication terminal having a wireless communication function and transmits a signal of a primary common pilot channel to the communication terminal, a transmission power value notification method for notifying the communication terminal of a transmission power value,
A process of comparing the first notification power value transmitted from the radio base station controller that controls the radio base station with a preset first threshold value;
As a result of the comparison, when the first notification power value and the first threshold value are different, the first notification power value is recognized as the transmission power value of the primary common pilot channel transmitted from the radio base station. Processing to
As a result of the comparison, if the first notification power value and the first threshold value are the same, the first corrected power value and the first notification power value transmitted from the radio base station controller are obtained. Processing for recognizing the added value as the transmission power value of the primary common pilot channel transmitted from the radio base station;
A process of comparing the recognized transmission power value with a preset second threshold;
As a result of the comparison, when the transmission power value is greater than or equal to the second threshold, a process of transmitting the transmission power value as the second notification power value to the communication terminal with the transmission power;
As a result of the comparison, when the transmission power value is smaller than the second threshold value, the second threshold value is set as the second notification power value, and a value obtained by subtracting the second threshold value from the transmission power value is obtained. A transmission power value notification method comprising: a process of transmitting the second notification power value and the second correction power value to the communication terminal with the transmission power as a second correction power value. A transmission power value notification method in which a radio base station controller that controls a radio base station that transmits a signal of a primary common pilot channel to a communication terminal having a radio communication function notifies a transmission power value from the radio base station to the communication terminal Because
A process of comparing a transmission power value set in advance as a transmission power value of the primary common pilot channel with a preset threshold value;
As a result of the comparison, when the transmission power value is greater than or equal to the threshold, a process of transmitting the transmission power value to the radio base station as a notification power value;
As a result of the comparison, when the transmission power value is smaller than the threshold value, the threshold value is set as the notification power value, a value obtained by subtracting the threshold value from the transmission power value is set as a correction power value, and the notification power value and the correction A transmission power value notification method comprising: a process of transmitting a power value to the radio base station. A communication terminal having a wireless communication function and configured to be connectable to a wireless base station that transmits a signal of a primary common pilot channel recognizes a transmission power value from the wireless base station,
A process of comparing a notification power value included in a radio control message transmitted from the radio base station with a preset threshold value;
As a result of the comparison, when the notification power value and the threshold value are different, processing for recognizing the notification power value as a transmission power value of the primary common pilot channel transmitted from the radio base station;
As a result of the comparison, when the notification power value and the threshold value are the same, a value obtained by adding the correction power value included in the radio control message transmitted from the radio base station and the notification power value to the radio base station Recognizing the transmission power value of the primary common pilot channel transmitted from a station.

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